1. Department of Internal Diseases, Allergology and Clinical Immunology; Medical University of Silesia; Katowice Poland
2. Department of Internal Diseases, Diabetology and Nephrology; School of Medicine with the Division of Dentistry in Zabrze; Medical University of Silesia; Katowice Poland
3. Department of Internal Diseases and Nephrodiabetology; Medical University of Lodz; Lodz Poland